1. First, select the custom control button option in the custom menu 2. Turn the speed dial to select the button to redefine, and the preview button of depth of field is selected.

2. Secondly, the rotation speed control dial selects the option to switch to the registered autofocus point. Manually select the autofocus point.

3. Finally, press the LCD illumination button while pressing the autofocus point selection button to register the selected autofocus point in the camera. To use this function when shooting, just press the function button assigned in step 2. The focus defined in step 4 will be activated and become the current focus.